این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
مهندسی عمران مدرس، جلد ۱۸، شماره ۴، صفحات ۰-۰
عنوان فارسی اثر روش های مقیاس کردن رکوردهای جنبش زمین بر توزیع تغییر مکان نسبی قابهای خمشی فولادی طراحی شده به روش پلاستیک مبتنی بر عملکرد
چکیده فارسی مقاله در این پژوهش اثر شش روش مقیاس کردن رکوردهای جنبش زمین بر پاسخ حداکثر تغییر مکان غیر الاستیک قاب های خمشی فولادی طراحی شده به روش پلاستیک مبتنی بر عملکرد، با دو طیف هدف حد اکثر زلزله محتمل و طیف طرح، مورد مطالعه قرار گرفته است. در این روش از یک دریفت هدف و مکانیزم تسلیم از پیش تعیین شده به عنوان حالت حدی عملکردی استفاده می گردد. این روش طراحی پیشنهادی بر اساس تئوری طراحی پلاستیک می باشد که در آن مقادیر نیروهای طراحی با استفاده از اصل بقای انرژی استخراج می گردد. برای رسیدن به این هدف سه قاب 4، 8 و 16 طبقه که براساس روش فوق طراحی شده اند تحت 42 رکورد حوزه دور که با 6 روش مقیاس شده اند، تحلیل دینامیکی غیرخطی شده اند و توزیع حداکثر تغییر مکان غیر الاستیک در ارتفاع محاسبه شد. هدف از این مطالعه، ارزیابی دقت روش های مختلف مقیاس کردن جنبش زمین در در محاسبه حداکثر تغییر مکان غیرالاستیک قابهای خمشی و تعیین مناسب ترین روش را با توجه به کارایی و دقت آنها به صورت پارامتریک می باشد.
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Effect of Ground Motion Scaling Methods on Inter-story drift Distribution of Steel-Moment Frames Designed Based on Performance-Based Plastic Design
چکیده انگلیسی مقاله Time history analysis, which is the most important analysis tool in performance-based seismic design, has become more and more popular worldwide. In the seismic design, seismic demand is mainly governed by three factors including the peak value of ground motion, the characteristic of earthquake spectrum and duration. An earthquake intensity index of ground motions is normally used as a scaling parameter that is critical for seismic analysis and design. A number of researchers have, from their own perspective, proposed various intensity indices. However, due to the complexity and randomness of earthquake motion, it has been a difficult task to accurately evaluate the applicability of various existing intensity indices. In addition, an objective and quantitative method is lacking in the evaluation of the applicability of such indices. This has been a challenging issue in seismic engineering research and has become a fundamental problem in performance-based seismic design. Nonlinear structural response is often highly sensitive to the scaling of input ground motions. Thus, many different ground motion scaling methods have been proposed. The "severity" of an earthquake ground motion is often quantified by an intensity measure, IM, such as peak ground acceleration, PGA, or spectral acceleration at a given period. The PGA of a record was a commonly used IM in the past. More recently, spectral response values such as spectral acceleration at the fundamental period of vibration have been used as IM. Scaling of ground motions to a given spectral level at the fundamental period of vibration significantly decreases the variability in the maximum demand observed in the structural system. However, it is widely known that for records with the same spectral acceleration at the fundamental period of vibration value, spectral shape will affect the response of multi-degree of- freedom and nonlinear structures, because spectral values at other periods affect the response of higher modes of the structure as well as nonlinear response when the structure's effective period has lengthened. Similar attention to the influence of nonlinear behavior of a structure on the period of vibration led to an IM that accounts for period softening to reduce variability at high levels of maximum inter-story drift ratio, drift demands larger than 5%, for composite structures. Previous studies have focused on evaluation of different ground motion scaling methods in single-degree-of freedom and buildings of multi-degree-of-freedom with shear-type behavior or common steel-moment frame structures. However, over the last decade, the performance-based seismic design philosophy has emerged as a promising and efficient seismic design approach. The novel Performance-based plastic design (PBPD) approach explicitly accounts for the inelastic behavior of a structural system in the design process itself. PBSD approaches based on plastic analysis and design concepts were recently developed for different lateral load resisting systems such as steel moment resisting frames, steel braced frames, etc. In these design methods a pre-selected yield/failure mechanism and a uniform target drift (based on inelastic behavior) were considered as performance objectives. The analytical validation of these methods showed that structures designed using these methods were very effective in achieving the pre-selected performance objectives. Considering a gradual shift towards PBSD for seismic design methods in general, this study is aimed at examining the effects of six different IMs on the estimation and distribution of the maximum inter-story drift for three short, moderate, and long-period steel-moment resisting frames designed with PBPD method buildings using the concepts of efficiency and sufficiency. An ensemble of 42 far-filed earthquake ground motion without pulse characteristics were used and scaled based on two target spectrum MCE and Design Response Spectrum to conduct nonlinear dynamics analyses by using OPENSEES. Results indicate that, the cod-compliant scaling method was not reliable for nonlinear dynamic analyses of structures designed by PBPD method, and cloud be very sensitive to the ground motion characteristics. Among them, depending on the number of stories, the three scaling methods including scaling ground motions to a given PGA and those that take into account for periods of higher modes generally decrease the variability in the maximum demand observed in the structural systems.
کلیدواژه‌های انگلیسی مقاله
نویسندگان مقاله بهنود گنجوی | Behnoud Ganjavi
Department of Civil Engineering, University of Mazandaran, Babolsar, Iran
دانشکده عمران، دانشگاه مازندران، بابلسر، ایران

امیر علی هادی نژاد | Amir Ali Hadinejad
Department of Civil Engineering, University of Mazandaran, Babolsar, Iran
دانشکده مهندسی عمران، دانشگاه مازندران، بابلسر، ایران

ابوالفضل غلامرضاتبار | Abolfazl Gholamrezatabar
School of Civil Engineering, Center of Excellence for Fundamental Studies in Structural Engineering, Iran University of Science & Technology, Narmak, Tehran, Iran
دکتری عمران، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران

مجید برارنیا | Majid Bararnia
Department of Civil, Water & Environmental Engineering, Shahid Beheshti University, Tehran, Iran
دانشکده عمران، آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران

نشانی اینترنتی http://journals.modares.ac.ir/browse.php?a_code=A-16-25722-1&slc_lang=fa&sid=16
فایل مقاله فایلی برای مقاله ذخیره نشده است
کد مقاله (doi)
زبان مقاله منتشر شده fa
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات